One of my favorite features in Windows is the ability to press -1 to switch to the leftmost window in the "Window buttons", -2 to go to the 2nd one, and so on, as opposed to alt-tabbing through everything.
I remember reading that I could assign a script to a key combination to switch to a specifiy window title, but I'd like to be able to switch based on its position in the taskbar.
(Also I think Unity can do this, but I'd really rather stick with XFCE)